1970 Earth Day Quotes: ‘Civilization will end within 15 or 30 years unless immediate action is taken against problems facing mankind’ — George Wald, Harvard Biologist

Paul Ehrlich, Stanford U.: 'Population will inevitably and completely outstrip whatever small increases in food supplies we make. The death rate will increase until at least 100-200 million people per year will be starving to death during next ten years.'